OK... you KNOW yer onions about A/C. I'm talking about the small interior of a Nonsuch 22 and I am liking the idea of some reasonable bulkhead mounting of a 5000 BTU 'portable' unit as close to the cabin top as I can with a single exhaust hose being vented 'outside' somehow. At around 6' of headroom, the cabin space must be around 7' of beam by 10' in length i.e. roughly 70 sq. ft or 420 cubic ft.

I would imagine that this would do the trick - what say you (and thanks, BTW)